592 CYPERACE^. (sedge FAMILY. > 



ytigmas 3 ; spikes erect or ascending. 

 Perigynium haii'y. — Spikes very large, globose . ... ... 6 



Spikes very small, sessile or, nearly so . SI - S3, 85-92 



Spikes cylindi'ical, heavy . . . . . . 24-28 



Perigynium granular-roughened . . .,...,. 28 



Perigynium smooth. 

 Thin and turgid, loosely enclosing the achene. — Beakless ... 58, 59 



Beaked . . . .5-17 



Firm in texture, not inflated, 



Long-beaked, deeply toothed . . 2-4,26,28 



Less prominently beaked, short-toothed, sharply 3-angle.d . . . .69-74 

 Wholly beakless and pointless .... . . 58, 59, 63, 78. 79 



Very small, black and shining ; leaves capillary 80 



Culm and leaves thinly pubescent . . 64 



Perigynium more or less pointed or beaked. 



Spikes spreading or drooping . .... 51-53,68-70,75 

 Spikes erect 60-62,65-68,71-78 



* 1. Physocarp.t:. — -i- 1. PauciJlorcB. 



1. C. pauciflora, Lightf. (PI. 5, fii^. I-I6.) Very slender but erect, 

 6-18' high; leaves very narrow, much sliorter than the culm; stamiuate and 

 pistillate flowers 2 - 5 ; perigynium at maturity easily detached. — Cold sphag- 

 num swamps, New Eng. to N. Penn. and Minn. ; local. (Eu.) 



* 1. — -1-2. LiipuRnce. 



++ Teeth of the perigynium strongly reflexed. 



2. C. SUbulata, Michx. Green, very slender but erect, 6' -2° high; 

 leaves narrow, somewhat shorter than the culm ; bracts leafy, sheathing ; 

 pistillate spikes 2-4, scattered, 2 - 6-flowered ; perigynium deflexed. — Deep 

 sphagnum swamps, R. I. to E. Penn., and southward; very local. 



-M- ++ Teeth erect or spreading. 



= Whole plant yellowish ; perigynium little or not at all inflated. 



3. C. Michauxiana, Boeckl. Slender but stiff and erect, 1-2° high; 

 leaves narrow and firm, shorter than the culm; spikes 2-3, the lowest 

 usually remote and short-peduucled, the remainder aggregated and sessile ; 

 staminate spike sn^all, wholly sessile ; perigynium not inflated, erect or spread- 

 ing, twice longer than the blunt scale. (C. rostrata, Michx.) — Bogs and lake- 

 borders, mountains of N. H. and N. Y., and westward to L. Superior ; local. 



4. C. folliculata, L. Stout, 2-3° high; leaves very broad and flat, 

 lax; pistillate spikes 3-4, scattered, all but the uppermost prominently pe- 

 duncled; staminate spike short-peduncled ; perigynium larger, inflated, the 

 scale awned and nearly as long. — Cold swamps, New Eng. to N. J. and Penn., 

 and west to Mich. ; rather local. 



= = Plant green ; perigynium much inflated. 



5. C. intumescens, Eudge. Slender, 18-30' high; leaves narrow; 

 pistillate spikes two, loosely 1-8-flowered, the perigynium erect-spreading, 

 not prominently many-nerved. — Wet pastures and swamps ; common. 



6. C. Grayii, Carey. Larger and stouter; leaves broad and flat, 3-4" 

 wide; pistillate spikes 1 or 2, the lowest often peduncled, perfectly glob- 

 ular and compactly 12-30-flowered, the perigynium spreading or deflexed 

 and prominently many-nerved. — Meadows and copses, Yt. to 111., and south 



